We formulate axion-electrodynamics and magnetohydrodynamics (MHD) in the cosmological context assuming weak gravity. The two formulations are made for a general scalar field with $f(\ensuremath{\phi})$-coupling, an axion as massive ${\ensuremath{\phi}}^{2}$-coupling, helical electromagnetic field. $\ensuremath{\alpha}$-dynamo term appears naturally from coupling MHD formulation. In presence of ...

Turbulence in an incompressible fluid with and without a magnetic field as well as moderately compressible MHD turbulence are compared. The results of three numerical simulation models in three dimensions of resolution up to 512 are used for this purpose. The compatibility of the spectra of all three models with the Kolmogorov spectrum is confirmed. For the magnetohydrodynamic (MHD) models the ...

We address the problem of controllability MHD system in a rectangular domain with control prescribed on side boundary. identify necessary and sufficient condition data to be null-controllable, i.e., can driven zero state. also show that validity this allows states stirred each other. If is not satisfied, one move from state another help simple shear external magnetic force.

The discovery of the hydrodynamic electron liquid (HEL) in graphene [D. Bandurin \emph{et al.}, Science {\bf 351}, 1055 (2016) and J. Crossno 1058 (2016)] has marked birth solid-state HEL which can be probed near room temperature a table-top setup. Here we examine terahertz (THz) magneto-optical (MO) properties HEL. Considering case where magnetic length $l_B=\sqrt{\hbar/eB}$ is comparable to m...

Non-thermal emission from Active Galactic Nuclei (AGN) jets extends up-to large scales in-spite of them being prone to a slew magneto-hydrodynamic instabilities. The main focus this study is understand the impact MHD instabilities on non-thermal large-scale AGN jets. We perform high-resolution three-dimensional numerical simulations plasma column investigate dynamical and properties jet configu...

A postprocess analysis of a single time frame hydrodynamic profile from the PRISM two-dimensional MHD simulation of an argon gas puff Z-pinch plasma experiment on Double-Eagle generator at Physics Internationals, Co. is presented. In addition, spatially resolved emission spectra and filtered (Kand L-shell radiation) x-ray pinhole images, generated using the SPEC2D code, are examined toward the ...

We derive a probabilistic interpretation of generalized solution the Cauchy problem for three-dimensional system magneto-hydrodynamics equations called MHD-Burgers system. First we regularize under consideration and prove that there exists unique measurevalued regularized Next justify limiting procedure with respect to regularization parameter and, as consequence, existence uniqueness original ...

We use the AdS/CFT correspondence to study propagation of sound waves in strongly coupled (2+1) dimensional conformal magnetic fluids. Our computation provides a nontrivial consistency check of the viscous magneto-hydrodynamics of HartnollKovtun-Müller-Sachdev to leading order in the external field. Depending on the behaviour of the magnetic field in the hydrodynamic limit, we show that it can ...